06-09-2016, 09:50 AM
1453112689-Automaticsheetmetalcuttingmachine.pptx (Size: 1.22 MB / Downloads: 5)
Abstract
Automatic machine aimed at the economical use of man, machine, and material worth the most. In our project is solenoid valve and control timing unit is used for automation. The sheet metal cutting machine work with the help of pneumatic double acting cylinder.
The piston is connected to the moving cutting tool. It is used to cut the small size of sheet metal. The machine is portable in size, so easy transportable
The compressed air from the compressor is used as the force medium for this operation there are pneumatic double acting cylinder solenoid valve, flow control valve and their timer unit is used the arm from the compressor enters to the flow control valve
Introduction
The sheet metal cutting process is a main part of the all industries. Normally the sheet metal cutting machine is manually hand operated one for medium and small scale industries. Automation in the modern world is inevitable.
Working principle
The compressed air from the compressor at the pressure of 7 to 10 bar is passed through a pipe connected to the Solenoid valve with one input. The Solenoid Valve is actuated with Control Timing Unit. The Solenoid valve has two outputs and one input. The air entering into the input goes out through the two outputs when the timing control unit is actuated.
Due tothe high air pressure at the bottom of the piston, the air pressure below the piston is more than the pressure above the piston. The material is placed in between the fixed and moving cutter. When the piston is at the extreme point of the stock length, the exhaust valve is opened and the air is exhausted through it and the pressurized air come in at the top of the piston and it pushes the piston downwards
Compressor
The compressors used for compressing air are called air compressors. Compressors are invariably used for all applications requiring high pressure air. Some of popular applications of compressor are, for driving pneumatic tools and air operated equipments, spray painting, compressed air engine, supercharging surface cleaning, refrigeration and air conditioning, chemical industry etc.
compressors are supplied with low pressure air (or any fluid) at inlet which comes out as high pressure air (or any fluid) at outlet. Work required for increasing pressure of air is available from the prime mover driving the compressor. Generally, electric motor, internal combustion engine or steam engine, turbine etc. are used as prime movers
Capacity of compressor is 7 to 10 bar we used in this machine
Solenoid valve
The directional valve is one of the important parts of a pneumatic system. Commonly known as DCV, this valve is used to control the direction of air flow in the pneumatic system.
The directional valve does this by changing the position of its internal movable parts.
Thisvalve was selected for speedy operation and to reduce the manual effort and also for the modification of the machine into automatic machine by means of using asolenoid valve
Pneumatic cylinder
Although pneumatic cylinders will vary in appearance, size and function, they generally fall into one of the specific categories shown below. However there are also numerous other types of pneumatic cylinder available, many of which are designed to fulfill specific and specialized functions.
Single-acting cylinders
Single-acting cylinders (SAC) use the pressure imparted by compressed air to create a driving force in one direction (usually out), and a spring to return to the "home" position. More often than not, this type of cylinder has limited extension due to the space the compressed spring takes up. Another downside to SACs is that part of the force produced by the cylinder is lost as it tries to push against the spring.
Double-acting cylinders
Double-acting cylinders (DAC) use the force of air to move in both extend and retract strokes. They have two ports to allow air in, one for outstroke and one for in stroke. Stroke length for this design is not limited, however, the piston rod is more vulnerable to buckling and bending. Additional calculations should be performed as well.